2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90286We have shown quant-ph/0206104 (Lett. Nuovo Cimento, 1972, 4, 344) that for free particles and antiparticles with mass m>0 and arbitrary spin s>0, in the framework of the Poincare group P(1,3), there exist three types of nonequivalent equations. In the present paper we study the P, T, C properties of these equations.5 pagesQuantum PhysicsMathematical PhysicsExactly Solvable and Integrable Systemstext